Disposable syringe



Aug. 9, 1949. A. E. SMITH I 2,478,844 v DISPOSABLE SYRINGE Filed De. 15, 1947 za 27 37 .fz .5569023 zag "15. J 4.5'

` INVENTOR. Afr/MPE 'SN/7H l l ,477' Ms'y Patented Aug. 9, 1949 UNITED STATESA PAT OFFICE DISPOSABLE SYRINGE Arthur E. Smith, Los`Angeles; Salif. Application. December 15, 1947, Serial No. 791,798

(Cl. 12S-215)* 4 Claims.

This invention relates to a disposable syringe.

The general object of the invention is to provide a novel, simply constructed, highly eicient syringe ofthe disposable type.

A more specific object of the invention is to provide a syringe including` an ampule or barrel having a novel plunger thereon.

Another Iobjection the invention is to provide a syringe includingY a plunger having a novel piston stopper thereon.

A further object of the. invention is to Iprovide a hypoderinic. syringe including a needle. which is` slidably mounted in a novel manner on the syringe. Y

Other objects and advantages ofl my inventicnwillv be apparent. from the following description taken in connection with the accompany-- ing drawings,. wherein:

Fig. 1 isa side elevation showing a syringeembodying the features oimy invention;

Fig; 2 is a central enlarged sectional View, partly in elevation, showing the syringe before it has been prepared for use.;

Fig. 3/ is a view similar tov Fig. 2. showing the syringe prepared for use;

Fig. 4 is a view similar to'Fig. 2, showingthey syringeaiter the: contents. have been discharged, and.

Fig. 5 is a view similar to. Fig. 2, showing a modication.

Referring to the drawing by reference characters, I haversliown my'inventionV as embodied' in a syringe which is indicated generally at III. As shawn the syringev includes a barrel I I which is cylindrical and at the rear end includes a closure I2 whichV maybe made of rubber and is seated. Within. the barrel.VA The. stopper has` an enlarged flanged bead I3 at the outer endthereey(if. The stopper includes an axial, inwardly opening recess- Id, closed at the outer end by a a diaphragm I 5. If- 'servesv to mark the location: in which. a'nv am.- pulev filling needle may be inserted;

Thasyring includes a plunger I9 which comprises a cylindrical body 2U, having an out"- wardly directed nger engaging ange 2| intermediate its length and having forwardly extending end tip 22a from which a reduced end tip 22 extends. The end tips have an axial recess 23 which communicates with an axial hole 21 in the plunger. The inner end of a hypodermic needle 24 is disposed in the recess and hole. The end tip 22EL has a pair of internal grooves 22h and 22.

The `outer end of the needle is provided with An axial dent or indentation' 2 al bulbous. portion 25' whichv is seated in a substantially hemispherical seat. 26 at. the end cfa, recess 28. in. a. closure member 29. The closure member recess 28 is of. Tess diameter than. the diameter ot the bulbous portion 25. The outer end.` 30- of the needle is arrangedin an axial! re.- cess 3I' and extends through a. diaphragm 32 ata the outer end of the recess. 3.1L

The closure member 29 has. an outwardly directed bead. 32'. Normally the bead. 32" engages in. the groove 22C. When the closure member 29. is. moved. axially into the plunger, the needle, due. to engagement of the protuberance 25 with the closure,Y will be moved inwardly. The bead 32' will then-i enter the groove. 225..

rlhe inner endof the plunger is providedwitha piston stopper 35 which has. areduced outer endl :i5-seated inarecess 31 in the plunger. Engagement of a bead38 on. thepis-ton in a groove.A 39 in: the plunger holdsl the piston stopper in.y place.. At itsinner end: the piston stopper is. providedwith an enlarged portion 40 which has piston beads 4I thereony engaging the inner wall. of the ampule II..4 'I'.heV piston stopper includes anAv outwardly directed axial recess 42 and a second.. axia1frecess-43 whichl opensinwardly, the-'two recesses.- bei-ng. separated. by a diaphragmY 44'.

Thef ampule: may be'madeA of glass or plastic. Thel plungerv may be made of rubber or plastic. whilethe closure 23... the stopper I3 and the. piston, stopper. 35 are preferably made of a good. grade of rubber.

Inuse theparts are assembled and shipped as-shown in Fig.. 1. and Fig.. 2, withv4 asen'ii-i'lexibley protective cap member 50 over the outer endA 3l)l ot the needle, the innerl end. of which isY supported by the reduced portion 22- of theplunger. For use. the operator moves the closure'29.- in wardly so' thatv the closure assumes thev position: shown in Fig. 3' and in this position` the inner end tip-45 cfthe needle, which issharpenedy haspierced. thef diaphragm. 44;. thus placing` the. needlein. communication withathecontents of the ampu-ler,l

insertioninto.V thebodas7 of the patient is. then made, atten which the operatorslightlywithdraws the ampule from the plunger. needle has been inserted into a blood vessel, blood will be aspirated into the ampule, thus warning the operator of the location of the needle and he can withdraw the needle and make a fresh insertion. When the needle has been properly inserted, the injection may be made by pressing on the closure I2 with the thumb while the iingers engage the flange 2|.

Iif ther of the piston stopper is provided with an axial recess 6D which communicates with a second axial recess 6l. The recess 60 is closed by a disc 62 while in the recess El I place a medicinal pellet 63.

In using the modified device the front closure 29 is moved inwardly, causing the needle tip 45,'` to pierce Ythe diaphragm 44 and then cause dislodgement of the disc 62, causing the pellet 63 to be discharged into the ampule, whereupon a fresh injection ismade as previously described.

From the foreging description it will be apparentthat I have invented a vnovel syringe which can be economically manufactured and which is highly efficient for its intended use.`

Having thus described my invention, I claim:

1. A disposable `syringe including a barrel hav-, ing a closure at one end and being open at the other end, a plunger slidable in said barrel, said plungerY having a recessed portion at its inner end, l

said recessed portion including an inwardly directed groove, ak piston having a reduced` end disposed in said recess, said piston having a bead fitting saidgroove, said piston having an axial recess and having` a diaphragm closing said recess, said plunger having anl axial hole therethrough and aligned with said recess, ay tip on the front end of said plunger, said tip having a recess, an end closure slidable in said tip recess and a needle arranged in said tip and movable with the tip and having a sharpened inner end normally adjacent to, but not piercing, said diaphragm.

2. A disposable syringe including a barrel having a closure at one end and being open at the other end, a plunger slidable in said barrel, saidv plunger having a recessed portion at its inner end, said recessed portion including an inwardly directed groove, a piston having a reduced end disposed in said recess, said piston having a bead fitting said groove, said piston havingan axial recess and having a diaphragm closing said recess, said plunger having an axial bore therethrough and aligned with said recess, said plunger having a iinger engaging portion, a reduced tip on the front end of said plunger, said reduced tip having a recess, an end closure slidable in said reduced tip recess, a needle arranged in said plunger axial bore and having a sharpened inner end normally adjacent to,v but not piercing, said diaphragm, said needlev having a vprotuberance thereon, said end closure having a hole through which said needle extends, said end closure including a seat engaging the protuberance on said needle.

3. A disposable syringe including a barrel having a closure at one end and being open at the other end, a plunger slidable in said barrel, a piston on said plunger, said piston having an axial recess and having a diaphragm closing said recess, said plunger having an axial bore therethrough and aligned with said recess, said plunger having a nger engaging flange thereon, a reduced tip on the front end of said plunger, said reduced tip having a recess and having spaced inwardly opening grooves therein, an -end closure slidable in said reduced tip recess, aid end closure having a bead thereon, said b ad normally being engaged in one of said groo es, said closure being movable so that the bead is engaged in the other groove, a needle arranged in said plunger axial bore and having a sharpened inner end adjacent to, but not piercing, said diaphragm, said needle having a protuberance thereon, said end closure having a hole through which said needle extends, said end closure including a seat engaging the protuberance on said needle.

4. A disposable syringe including a barrel having a closure at one end and being open at the other end, a plunger slidable in said barrel, said plunger having an axial recessed portion at its inner end, said recessed portion including an inwardlyl directed groove, a piston having a reduced end disposed in said recess, said piston having a peripheral bead tting said groove, said piston having an axial recess and having an intermediate diaphragm closing said recess, a medicinal preparation in the inner end of said recess, a disc closing the inner end of the recess beyond the preparation, said plunger having an axial bore therethrough and aligned with said recess, said plunger having a nger engaging flange integral therewith, a reduced tip on the front end of said plunger, said reduced tip having a recess f andV having spaced inwardly opening grooves 1 through which said needle extends, said end closure including a substantially hemisphcrieal sect engaging the protuberance on said needle.

ARTHUR E. SMITH.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 1,770,634 Smith (2) July 15, 1930 1,843,554V Goldberg Feb. 2, 1932 2,022,369 Curtis Nov. 26, 1935 2,362,165 Smith (1) Nov. 7, 1944 

